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MAX232EESE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX232EESE Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 25 page ______________________________________________________________________________________ 11 ±15kV ESD-Protected, +5V RS-232 Transceivers V+ V- 200 µs/div 3V 0V 10V 5V 0V -5V -10V SHDN MAX211E Figure 5. MAX211E V+ and V- when Exiting Shutdown (0.1µF capacitors) X = Don't care. *Active = active with reduced performance SHDN E EN N OPERATION STATUS Tx Rx 0 0 Normal Operation All Active All Active 0 1 Normal Operation All Active All High-Z 1 X Shutdown All High-Z All High-Z Table 1a. MAX205E/MAX206E/MAX211E/ MAX241E Control Pin Configurations Table 1b. MAX213E Control Pin Configurations The MAX213E’s receiver propagation delay is typically 0.5µs in normal operation. In shutdown mode, propagation delay increases to 4µs for both rising and falling transitions. The MAX213E’s receiver inputs have approximately 0.5V hysteresis, except in shutdown, when receivers R4 and R5 have no hysteresis. When entering shutdown with receivers active, R4 and R5 are not valid until 80µs after SHDN is driven low. When coming out of shutdown, all receiver outputs are invalid until the charge pumps reach nominal voltage levels (less than 2ms when using 0.1µF capacitors). ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs have extra protection against static electricity. Maxim’s engineers developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup. ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits: 1) ±15kV using the Human Body Model 2) ±8kV using the contact-discharge method specified in IEC1000-4-2 3) ±15kV using IEC1000-4-2’s air-gap method. ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test set-up, test methodology, and test results. Human Body Model Figure 6a shows the Human Body Model, and Figure 6b shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5k Ω resistor. S SH HD DN N EN OPERATION STATUS Tx 1–4 0 0 Shutdown All High-Z 0 1 Shutdown All High-Z 1 0 Normal Operation 1 1 Normal Operation All Active All Active Active 1–3 4, 5 High-Z Active High-Z High-Z High-Z Active* High-Z Rx |
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